Strength Evaluation of Multilayer Glass–Ceramic Sealants

Authors

  • B. Cela Greven,

    1. Forschungszentrum Juelich GmbH, Central Institute for Technology, 52425 Juelich, Germany
    2. Institute of Mineral Engineering, Department of Glass and Ceramic Composites, RWTH-University Aachen, Mauerstrasse 5, 52064 Aachen, Germany
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  • S. M. Gross-Barsnick,

    Corresponding author
    1. Forschungszentrum Juelich GmbH, Central Institute for Technology, 52425 Juelich, Germany
    • Forschungszentrum Juelich GmbH, Central Institute for Technology, 52425 Juelich, Germany
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  • D. Federmann,

    1. Forschungszentrum Juelich GmbH, Central Institute for Technology, 52425 Juelich, Germany
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  • R. Conradt

    1. Institute of Mineral Engineering, Department of Glass and Ceramic Composites, RWTH-University Aachen, Mauerstrasse 5, 52064 Aachen, Germany
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  • Paper presented at the 10th European SOFC Forum 2012, June 26–29, 2012 held in Lucerne, Switzerland. Organized by the European Fuel Cell Forum – www.efcf.com

Abstract

The glass–ceramic sealants developed at Forschungszentrum Juelich already meet several of the requirements for their potential use in SOFC stacks. The adequate choice of glass materials and adaptation of the joining and design parameters are essential for stack assembling. Successful long time operation of stacks depends on sufficiently high bond strength between sealant and other components. Currently one of the major problems has been to find a glass–ceramic sealant with appropriate strength withstanding operation conditions. Therefore a reinforcement concept was developed based on addition of silver particles, YSZ fibers or particles as fillers in glass matrix from the system BaO–CaO–SiO2. Additionally different screen-printed laminar combinations were prepared as double and triple layer design. The double layer design consists in one with ceramic filler and another one with metal filler addition. Triple layer design was set up by establishing two identical films on the outer sides and one different reinforcement layer in the center plane. In order to evaluate the multilayer designs' strength, tensile tests were carried out on circular butt-joints. The three layers combination showed best performance. Samples could be qualitatively compared in a relative ranking. Changes in the tensile test configuration were proposed to improve future evaluation.

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